Micrometer-caliper thimble.



F. 0. JQUES, Sn.-

MlCROMETER CAUPER THIMBLEr APPLICATION min frs. u. |911.

L"`2,G0 Patented Jar; 1, 191@ Piva-Q i l IN1/Mraz? ma v 'INTITID STATE 'l 'PATENT FFIQR. l

FERNANDO OSCAR JAQUES, SR., OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE CENTRAL TOOL COMPANY, 0F AUBURN. RHODE ISLAND.

MICROMETER-CALIPER THIIVIBLE.

Specification of Letters Patent.

Patented Jan. 1, 1918.

Application led February 17, 1917. Serial No. 149,346.

To all whom t may cof/wem:

Be it known that I, FERNANDO OSCAR JAQUns, Sr., a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Micrometer-Caliper Thimbles, of which the following is a specification.

In micrometer calipers reading by one thousandth of an inch up to a predetermined limit, it is necessary to accurately set they micrometer in assembling the parts also from time to time when in use on account of wear 'between the spindle and the anvil and wear on the screw-threads of the spindle. This setting of the micrometer is usually done by turning the thimble and spindle until the reading is at Zero and then adjusting the anvil relative to the spindle, the thimble having the usual iXed lines and numerals indicating units of measurements. If the face of the anvil is parallel with the face end of the spindle when the instrument is lil-st assembled, the turning of the anvil in adjusting the same will usually throw the face of the anvil out of true with the face end of the spindle.

The object of my invention is to improve the construction of a micrometer caliper whereby the adjusting of the anvil for the above purpose is entirely eliminated, in fact the usual adjustable anvil may be dispensed with and a fixed anvil or an anvil formed integral with the frame of the instrument, may be used.

My invention has reference to an improvement in micrometer calipers and more particularly to an improvement in the thimbles of micrometer calipers.

My invention consists in the peculiar and novel construction of a micrometer caliper thimble, whereby the micrometer may be easily and quickly adjusted for accurate reading, by adjusting means on the thimble, and the usual adjustable anvil may be eliminated. Said adjusting means consisting of an indicating cylinder frictionally secured to the thimble and having the usual lines and numerals for indicating units of measurement, and means for adjusting the indicating cylinder on the thimble, as will be more fully set forth hereinafter and claimed.

Figure 1 is a side view of a micrometer caliper having a thimble embodying my invention.

Fig. 2 is an enlarged longitudinal sectional view through the spindle, thimble and adjustable indicating cylinder removed from the caliper. j

Fig. 3 is an'enlarged end view of the ad justable indicating cylinder, and

Fig. 4 is an enlarged longitudinal sectional view through the indicating cylinder', taken on line 4, 4 of Fig. 3 'and beforethe same is frictionally secured to the thimble;

In the drawing, 5 indicates the U shaped frame, 6 the anvil, which may now be fixed to the frame 5 or formed integral with the frame, 7 the sleeve on the frame and having the usual lines and numerals indicating units of measurements, as shown at 8 in Fig. 1 and 9 the screw-threaded spindle of the usual form of a micrometer caliper.

My improved thimble 10 is fixed at its outer end to the spindle 9 and turns with the spindle. The inner end of the thimble heretofore beveled at approximately thirty degrees and having the usual lines and numerals indicating units of measurement, is eliminated from the thimble proper. The inner end 11 of the thimble is now beveled at approximately fifteen degrees and this beveled inner end 11 now merges into a transverse annular groove 12 formed in the outer surface of the thimble, as shown in Figs. 1 and 2.

The indicating cylinder 13 has an inner beveled portion 14, a thin straight end por-k tion 15, an outer beveled end 16 having the usual indicating lines 17 on the beveled end and numerals 18 on the side of the cylinder and a tool hole 19, on the side. The inner beveled portion 14 is beveled at the same angle as the beveled end 11 of the thimble and fits snugly over the same. The indicating cylinder 13 is frictionally secured to the beveled end of the thimble by spinning or forcing the thin end portion 15 of the cylinder into the groove 12 in the thimble, as shownl at 20 in Fig. 2.

When it is necessary on account of wear, distortion or other causes, to set the micrometer for accurate reading, the spindle 9 is turned by the thimble 10 until the end of the spindle engages the face oi' the anvil 6. Then by the use of a necessary tool, not shown, in the tool hole 19 the cylinder 18 is turned on the thimble 10 until the zero line on the cylinder 13 coincides With the zero line on the sleeve 7 and these operations may be repeated at any time required.

Vhen an adjustable anvil is used, the face of the anvil and the face end of the spindle may be adjusted relative to each other and the reading of the micrometer then made accurate by turning the indicating cylinder on the thimble.

By the use of my improved construction in micrometer calipers, the micrometer can be easily and quickly set for accurate reading by the user at any time required, thereby eliminating,'as heretofore, the sending of the micrometer back to the manufactory to have the same reset and the consequent cost and loss of time in the use oit' the instrument, also the use and cost of the adjustable anvil may be entirely dispensed with.

Having thus described my invention I claim as new:

ln a micrometer caliper having a frame, an anvil on the frame, a sleeve on the frame and having` lines and numerals for indicating units of measurement, a screw-threaded spindle through the frame and sleeve, a thimble fast to the spindle and having an end beveled at approximately fifteen degrees and an outer annular groove, an indicating cylinder inwardly beveled at approximately fifteen degrees and frictionally fitting over the beveled end of the thimble, said indicating cylinder having a beveled end on Which are lines for indicating units of measurement, a series of numerals on its side for indicating units of measurement, a portion which enters the annular groove in the thimble and means for turning the indicating cylinder on the thimble.

In testimony whereof, I have signed my name to this speciiication.

FERNANDO OSCAR JAQUES, SR.

Copies of this patent may be obtained for ve cents cach, by addressing the Commissioner of Patents,

Washington, D. C. 

